Book 6.15

"According to this reasoning," says my opponent, "you would say that you owe nothing to a physician beyond his paltry fee, nor to your teacher, because you have paid him some money; yet these persons are all held very dear, and are very much respected." In answer to this I should urge that some things are of greater value than the price which we pay for them. You buy of a physician life and good health, the value of which cannot be estimated in money; from a teacher of the liberal sciences you buy the education of a gentleman and mental culture; therefore you pay these persons the price, not of what they give us, but of their trouble in giving it; you pay them for devoting their attention to us, for disregarding their own affairs to attend to us: they receive the price, not of their services, but of the expenditure of their time. Yet this may be more truly stated in another way, which I will at once lay before you, having first pointed out how the above may be confuted. Our adversary would say, "If some things are of greater value than the price which we pay for them, then, though you may have bought them, you still owe me something more for them." I answer, in the first place, what does their real value matter, since the buyer and seller have settled the price between them? Next, I did not buy it at it's own price, but at yours. "It is," you say, "worth more than its sale price." True, but it cannot be sold for more. The price of everything varies according to circumstances; after you have well praised your wares, they are worth only the highest price at which you can sell them; a man who buys things cheap is not on that account under any obligation to the seller. In the next place, even if they are worth more, there is no generosity in your letting them go for less, since the price is settled by custom and the rate of the market, not by the uses and powers of the merchandise. What would you state to be the proper payment of a man who crosses the seas, holding a true course through the midst of the waves after the land has sunk out of sight, who foresees coming storms, and suddenly, when no one expects danger, orders sails to be furled, yards to be lowered, and the crew to stand at their posts ready to meet the fury of the unexpected gale? and yet the price of such great skill is fully paid for by the passage money. At what sum can you estimate the value of a lodging in a wilderness, of a shelter in the rain, of a bath or fire in cold weather? Yet I know on what terms I shall be supplied with these when I enter an inn. How much the man does for us who props our house when it is about to fall, and who, with a skill beyond belief, suspends in the air a block of building which has begun to crack at the, foundation; yet we can contract for underpinning at a fixed and cheap rate. The city wall keeps us safe from our enemies, and from sudden inroads of brigands; yet it is, well known how much a day a smith would earn for erecting towers and scaffoldings to provide for the public safety.